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56 = 2. 3x + 2.4x
56 = 6x + 8x
56 = 14x
4 = x
3 == 12
4 == 16
lebar = 3/14 × 56 = 12 cm
*14 berasal dari keliling dalam perbandingan (3+3+4+4=14)
semoga membantu ^-^